Figure 288: Redundancy Connection For An M20 Router; Redundancy Connection For An M40E Or M160 Router - Juniper M Series Monitoring And Troubleshooting Manual

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M Series and T Series Routers Monitoring and Troubleshooting Guide

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Figure 288: Redundancy Connection for an M20 Router

M20 Router Redundant Routing Engines and SSBs on page 566

Figure 289 on page 573

shows the connection between the master and backup host

modules on an M40e or M160 router. Keepalive messages are sent from one Routing

Engine to the other over the

Interconnect (PCI) bridge. The keepalive message is received by the other host module

interface. A keepalive response is sent back over the

other Routing Engine. In this way, the master and the backup host modules exchange

state information.

interface found across the Peripheral Component

interface to the